/**
 * Copyright 2019 The AMP HTML Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

declare type TransferObject = CanvasGradient | CanvasPattern;

/**
 * Stores objects that have their behavior handled from the main-thread. Each object is associated to a unique ID.
 */
export class ObjectContext {
  private objects: Map<number, TransferObject>;

  constructor() {
    this.objects = new Map();
  }

  store(id: number, obj: TransferObject): void {
    this.objects.set(id, obj);
  }

  get(id: number): TransferObject {
    const obj = this.objects.get(id);

    if (obj) {
      return obj;
    } else {
      throw new Error('Object with id (' + id + ') does not exist.');
    }
  }
}
